[Radiance-general] Depth outdoor daylighting test facility

[Giuseppe De Michele]

Thank you at all for the precious help. We will take in account all your
advices.

In the next weeks I will update you with the project evolution.

Happy weekend,
Giuseppe
For another datapoint, the Research Support Facility here at NREL is rather
well daylit, and is 60' deep, but receives light from the north side as
well as the south, in addition to heavy use of daylight redirection from
the south. From experience (I've had a desk in the  middle of this building
for the last few years), I'd say that the daylight redirection devices
provide useful daylight as far back as 35' under ideal conditions, and on
average to 25' from the south wall. These devices can also paint the back
wall - 60' away from the source - with daylight! While impressive, I still
say that *useful* daylight from those things (i.e. horizontal task
illuminance >=250 lux) penetrates 35' or so at most; pretty much about as
deep as LBNL's new test space (FLEXLAB).

I also like Christoph's idea for a standard office reference model for
simulation; liked it the first time when it was called CIE 171:2006, too.
;) In all seriousness, I believe this Reinhart et al. model is a great idea
-- especially product comparisons in simulation, across climates.

- Rob

On 1/22/15, 11:24 AM, "Andrew McNeil" <amcneil at lbl.gov<mailto:
amcneil at lbl.gov>> wrote:

Hi Giuseppe,

At LBNL we find that our window test bed (10 feet wide by 15 feet deep)
isn't deep enough to demonstrate all the full benefits of daylight
redirection. In this facility the redirected daylight often hits the back
wall.

Our new FLEXLAB (20 feet wide by 30 feet deep) we believe these dimensions
are deep enough, but we haven't yet tested daylight redirecting systems in
FLEXLAB (coming this spring!).

I like Christoph's suggestion of a standard reference office for testing
systems via simulation. And if physical test cells match the dimensions of
the simulation standard, all the better. A global network of identical test
cells at different institutions would be amazing.

Andy


On Thu, Jan 22, 2015 at 8:36 AM, Christoph Reinhart <tito_ at mit.edu<mailto:
tito_ at mit.edu>> wrote:
Hi Giuseppe,

You might want to have a look at this document
http://mit.edu/sustainabledesignlab/projects/ReferenceOffice/index.html
which describe a reference office that can be used for the purposes
described by you.

Best,

Christoph

From: Giuseppe De Michele [mailto:giudm.87 at gmail.com<mailto:
giudm.87 at gmail.com>]
Sent: Thursday, January 22, 2015 11:28 AM
To: Radiance general discussion
Subject: [Radiance-general] Depth outdoor daylighting test facility

Dear experts,

I am involved in the design of an outdoor daylighting test facility.

I am trying to evaluate the minimum depth of the lab in order to be able to
study redirecting daylight systems (i.e. light shelves or complex lamella).
Cell height: 2.7 m and cell width: 5.5 m.

Our idea is to cover, let's say, "90%" of the applications of these systems.

Do you have experience in that field? Or can you suggest a modeling
approach to answer this question?

Thank you in advance.

Cheers,
Giuseppe.

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